Plumber wants to put in 2 huge radiators to each bedroom

[G and J]

  On 29/07/2024 at 07:04, JohnMo said:

MVHR summer bypass works in hot periods when outside air is cooler than the air being rejected. Therefore bypassing the heat exchanger.  If the house is cooler than outside it should operate in normal mode. So cool the incoming air via the heat exchanger.

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Ah, so the summer bypass kicks in automatically?  Presumably you can set threshold settings?

 

Summer bypass on = external temp is greater than y degrees AND internal temp is greater than external temp

[Dave Jones]

zehnder call it season detection, you can edit the limits.

 

[JohnMo]

  On 29/07/2024 at 07:53, G and J said:

, so the summer bypass kicks in automatically?  Presumably you can set threshold settings?

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On mine no, they are factory set.

[G and J]

  On 29/07/2024 at 10:55, Dave Jones said:

zehnder call it season detection, you can edit the limits.

 

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I’m seriously looking at a Zhender unit.  I’m now thinking the ASHP and the MVHR need to be linked.  

[G and J]

  On 29/07/2024 at 11:42, JohnMo said:

On mine no, they are factory set.

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I guess this is like the difference between having aircon in a car and climate control.   I’m thinking climate control for the house which would require control of both the MVHR and the ASHP from a single unit.  But that sounds like (yet another) budget buster.

[JohnMo]

  On 29/07/2024 at 11:46, G and J said:

guess this is like the difference between having aircon in a car and climate control.   I’m thinking climate control for the house which would require control of both the MVHR and the ASHP from a single unit.  But that sounds like (yet another) budget buster.

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Not really as @Dave Jones said earlier he had cooling on MVHR and it was not good.

 

Ventilation and cooling are different animals, with very different flow rates required, I wouldn't mix together in one unit. Plus if one side breaks down you loose both.

 

Cooling via your UFH loops in not too bad. 

[Originaltwist]

  On 28/07/2024 at 19:34, CalvinHobbes said:

jeekers the fan coil units are a bit pricey!

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there's always this DIY fan-coil idea

https://wordpress.com/post/originaltwist.com/2699

[Dave Jones]

  On 29/07/2024 at 11:46, G and J said:

I guess this is like the difference between having aircon in a car and climate control.   I’m thinking climate control for the house which would require control of both the MVHR and the ASHP from a single unit.  But that sounds like (yet another) budget buster.

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honestly dont bother. get fancoils instead.

 

for example It's currently 30C outside, solar is close to maxed out. heat pump is set at 15c to the UFH loop and fancoils, upstairs is at 22.5 and falling. the heat pump will cut out in another hour or so once the slab is at temp and upstairs will sit at 20/21 downstairs little cooler.

 

I have a bluetooth sensor we use to monitor, it says bathroom but its moved into one of the bedrooms at the moment.